>If you plan to use this drive with the compressor on you should not ALSO use software compression. The >tapes capacity for gzipped data would be closer to 50GB without the compressor. You would need >another amtapetype run without HW compression to check the actual capacity.
Is there a way that I can turn off hardware compression in Amanada? I do not have that option on the tape loader I use. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jon LaBadie Sent: Tuesday, March 14, 2006 3:52 PM To: [email protected] Subject: Re: Tape Type On Tue, Mar 14, 2006 at 01:23:17PM -0500, Carl Holzhauer wrote: > Just wanted to post this incase some one else has the same backup > device. > > Backup device is a Comapq Storage Works SSL2020 Tapes are Compaq AIT > 50GB amtapetype returns the following: > > define tapetype unknown-tapetype { > comment "just produced by tapetype prog (hardware compression on)" > length 43605 mbytes > filemark 0 kbytes > speed 5583 kps > } The typical 15% loss of native capacity when random data is fed through the tape drive's compressor due to its expansion of the random data rather than compression. If you plan to use this drive with the compressor on you should not ALSO use software compression. The tapes capacity for gzipped data would be closer to 50GB without the compressor. You would need another amtapetype run without HW compression to check the actual capacity. If, OTOH, you don't plan to gzip (SW compression) your amanda dumps and plan to let the drive's compressor do the job, then the above tapetype is meaningless. Depending on the compress- ability of your data, it could be anywhere from 50 to 150GB. It will be just a guesstimate. If amanda keeps filling your tapes, lower your guess. -- Jon H. LaBadie [EMAIL PROTECTED] JG Computing 4455 Province Line Road (609) 252-0159 Princeton, NJ 08540-4322 (609) 683-7220 (fax) __________________________________________________________ Message transport security by GatewayDefender.com 3:54:47 PM ET - 3/14/2006 __________________________________________________________ Message transport security by GatewayDefender.com 1:03:11 PM ET - 3/15/2006
